Questions tagged [manufacturing-process]

66 questions
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Why do some diodes have a glass package?

Put simply, why do some diodes such as most Zeners and Schottky diodes have a glass package as opposed to the more traditional plastic package? Is it ease of manufacturing, thermal properties, or some other electrical phenomenon?
Hugoagogo
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Why are resistors tolerances relative instead of absolute?

Every resistor has a tolerance, this provides the user with an idea of the accuracy of the product. This tolerance is represented by a percentage. This means: a big value resistor will be less accurate than a small resistor with the same tolerance.…
M.Ferru
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Environmentally sustainable electronics

I am part of my company's work to become more environmentally friendly and sustainable. On a high level for the company that means pursuing ISO certifications (such as ISO 14001) and working according to other standards. But I'm trying to figure out…
Lars Petersson
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Why can my bare PCB be magnetized?

I am working on a magnetic sensors design and noticed that my measured magnetic field bias shifts over time. I have studied the bare PCB and measured that it can be magnetized with a strong magnet. I tested two blank (unpopulated PCBS). The first…
Nullified
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What exactly makes small quantity PCB production costly compared to large quantity PCB production?

The per-PCB cost of manufacturing a small number of PCB is 10 times or more compared to the per-PCB cost of manufacturing a large number of PCBs. So what is it exactly that adds to the cost? People say there is setup cost or initial cost, what is it…
Vidit Katlana
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Solution to detect bad vias in production process

I face the problem of damaged (cracked) vias in a rigid/flex assembly. It is very difficult to detect those defects before mounting the assembly. Products with cracked vias may fail during lifetime while early detection seems difficult. The…
Ariser
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What shapes can IC dies be?

I know an IC die can be cut into a rectangular shape. Apparently triangles and rhombuses are also possible, but not used . What other tesselations can they be cut into?
Jacob Krall
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How do components not get knocked off or fall off during reflow?

I am looking at reflow ovens. A lot of them have a metal conveyor belt the boards sit on. On a double sided board, when you put the board on the metal belt, won't the metal belt knock components off as they are only held on by paste? In the case…
SA_A30
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Anyone know the premise of this PCB assembly note?

The assembly note states: Bake bare PCBs in a clean and well ventilated oven prior to assembly at 125*C for 24 hours. Why is this necessary?
klamb
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Microcontrollers Manufacturing Processes

I'm interested into know what semiconductor manufacturing processes are used in the most common PIC and AVR microcontrollers, in particular 8 bit microcontrollers. Obviously they are not at the same level of modern CPUs and GPUs (~20 nm), what is…
Oceanic815
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Why are the challenges in using SRAM over DRAM for main memory?

Historically, when compared to DRAM (dynamic ram), SRAM (static ram) is more expensive with a lower density, but it's much faster and more efficient. As a result, SRAM is reserved for devices, such as processor caches and microcontrollers, where…
user148298
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Behaviour of uninitialised RAM in an ASIC

This is a question for anyone with experience designing or with a deep knowledge of volatile memory in an ASIC. E.g. chip designers or silicon process engineers. We are using the ET1200 EtherCAT ASIC ( datasheet ) in one of our projects. First some…
Rocketmagnet
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Is BiCMOS still a popular technology?

A Google search has not yielded much fruit when it comes to this question, but I'm wondering if BiCMOS is still a reasonably popular technology (relative, of course, to any other non-CMOS technology). Most of what I have read seems to come from the…
EE18
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Production line soldering of solder cup connectors and wire

I have a need to solder a few hundred wires to bullet connectors with solder cups. I'm looking for suggestions for processes and tools/jigs that would ensure quality as safely and efficiently as possible. EDIT: Clarifying that my primary concern is…
Rick
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Populating MOLEX receptacles at industrial scale

I am a manufacturing engineer charged with implementing process improvements that reduce the total time to build an article. Our volume is such that a one minute reduction in labour results in £1K-£2K annual savings. It may not sound like much, but…
placebo_me_please
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